Strawn Daniel G, Rigby April C, Baker Leslie L, Coleman Mark D, Koch Iris
J Environ Qual. 2015 Jul;44(4):1315-20. doi: 10.2134/jeq2014.11.0477.
Biochar is a renewable energy byproduct that shows promise for remediating contaminated mine sites. A common contaminant at mine sites is arsenic (As). In this study, the effects of biochar amendments to a mine-contaminated soil on As concentrations in mountain brome ( Nees ex Steud.) were investigated. In the biochar-amended soil, mountain brome had greater root biomass and decreased root and shoot As concentrations. X-ray absorption near-edge structure spectroscopy results showed that arsenate [As(V)] is the predominant species in both the nonamended and biochar-amended soils. Soil extraction tests that measure phosphate and arsenate availability to plants failed to accurately predict plant tissue As concentrations, suggesting the arsenate bioavailability behavior in the soils is distinct from phosphate. Results from this study indicate that biochar will be a beneficial amendment to As-contaminated mine sites for remediation.
生物炭是一种可再生能源副产品，在修复受污染的矿区方面显示出前景。矿区常见的污染物是砷（As）。在本研究中，调查了向受矿山污染的土壤中添加生物炭对山地雀麦（Nees ex Steud.）中砷浓度的影响。在添加生物炭的土壤中，山地雀麦具有更大的根系生物量，且根和地上部分的砷浓度降低。X射线吸收近边结构光谱结果表明，砷酸盐[As(V)]是未添加生物炭和添加生物炭的土壤中的主要形态。测量植物可利用的磷酸盐和砷酸盐的土壤提取试验未能准确预测植物组织中的砷浓度，这表明土壤中砷酸盐的生物有效性行为与磷酸盐不同。本研究结果表明，生物炭将是受砷污染矿区修复的有益改良剂。
